The Quilt Ruler Upgrade Kit already comes with two Guide Lock Strips to attach on your 24" long ruler. They are not reusable, so if your ruler breaks or if you want to use the Fabric Guide on another 24" ruler, you'll need a replacement pack!
Ensure accurate cutting every time:
You need two Guide Lock Strips per 24" long ruler when using the 24" Fabric Guide.
The Strips keep the 24" Fabric Guide from shifting in the middle, so the Guide will stay perfectly straight on the line you set it to, no matter how much fabric you butt it up against.